package com.test.netty.websocket;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * @ClasName WSServerInitializer
 * @Descripution TODO
 * @Author USER
 * @Date 2022/3/5 14:10
 * @Version V1.0
 */
public class WSServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel channel) throws Exception {
        ChannelPipeline pipeline = channel.pipeline();

        //websocket 基本http协议，所以要有http解码器
        pipeline.addLast(new HttpServerCodec());
        //对大数据流的支持
        pipeline.addLast(new ChunkedWriteHandler());
        //对httpMessage进行聚合，聚合成FullHttpRequest或FullHttpResponse
        //几乎在netty中的编程，都会使用到此hanler
        pipeline.addLast(new HttpObjectAggregator(1024*64));

//        ========================  以上是用于支持http协议 =============================
//        ========================  以下是支持httpWebsocket =============================

        /**
         * websocket 服务器处理的协议，用于指定给客户端连接访问的路由 ： /ws
         * 本handler会帮你处理一些繁重的复杂的事
         * 会帮你处理握手动作：handshaking(close,ping,pong) ping + pong =心跳
         * 对于websocket来讲，都是以frames进行传输的，不同的数据对就的frames也不同
         */
        pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));

        pipeline.addLast(new CharHandler());
    }
}
